Magneto-alternator.



10.808 552. A PATENTED DE L. J. LE PoNToIs. C 26 1905 MAGNET@ ALTERNATR.

APPLICATION FILED SEPT. 24,1904.

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r//ff//f/ No. 808,552. PATBNTED DEG. 26, 1905. L. J. LB PONTOIS.

MAGNET() ALTERNATOR.

APPLICATION FILED SEPT. 24.1904.

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N0. 808,552. PATENTED DBC. 26, 1905. L. J. LE PUNTOIS. MAGNETOALTERNATOR.

APPLICATION FILED sBPT,z4.19o4.

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'UNITED srAgispilnNr OFFICE.

LEON JULES LE PONTOIS, OE NEW ROCHELLE, NEW YORK, ASSIGNOR TO-POLY-PHASE IGNITION SYSTEM COMPANY, A CORPORATION OE NEW YORK.

MAGNETO-ALTERNATOR.

Specication of Letters Patent.

Patented Dec. 26, 1905.

To all whom it Wha/y concern:

Be it known that I, LEON JULES LE PON- TOIs, a citizen ofthe Republic ofFrance, and a resident of New Rochelle, Vestchester county, New York,have invented a certain new and useful Improvement in Magneto-Alternators, of which the following is a specification.

My invention relates to a polyphase magneto-alternator designed todeliver to suitable sparking devices two alternating currents havingjointly or singly sufficient energy to cause the ignition of Yexplosivemixtures according to my Patent No. 752,690, dated February 23, 1904.

Owing to the fact that it is difficult to construct simplealternating-current Generators having collectors and moving coiIs, Ihave constructed an apparatus, one form of which is illustrated herein,with stationary coils and a rotating field, using a special form ofpermanent magnet for the field in order to avoid the necessity ofexciting the same by direct current,

In the following I have shown with reference to the accompanyingdrawings a structure illustrating one form of my invention,

the features thereof being more fully pointed out hereinafter intheclaims.

In the drawings, Figure l is a sectional view of my improved polyphasemagnetoalternator on the plane of the line A B of Fig. 2. Fig. 2 is asectional view of the same on the plane of the line C D of Eig. l. Figs.3, 4, 5, 6, and 7 are diagrammatic views showing the distribution of themagnetic field through the stator while the rotor moves through anrangleof one hundred and eighty degrees; and Fig. 8 is a diagrammatic viewshowing the respective values of the two alternating currents generated.

Similar reference characters indicate similar parts in the severalviews.

Referring to the drawings, the numeral 1 designates the outer casing ofnon-magnetic material, which casing is provided with an inturnedprojection 2, adapted to receive the elongated bearing 8 of the shaft 4.A drum 5, made of non-magnetic material, is rigidly mounted on the endof shaft 4 by means of the hub 6, which hub is preferably dropforgedwith the shaft. The drum 5 supports a ring 7, formed of a number ofsteel laminas l0, permanently magnetized. These laminae are made fast onthe drum by being clamped between the rim 8 and the screwring 9. Bysuitable magnetization two consequent poles N and S are developed atopposite ends of the same diameter. The laminas 10 are made slightlyelliptical in shape in order to better concentrate the magnetic flux atthe ends of the same diameter and to decrease as much as possible themagnetic leakage which would otherwise take place between the magnetizedring and the iron ring constituting the stator. By this means I obtain avery homogeneous permanent magnet thoroughly and evenly magnetizedthroughout its entire mass. The laminae are insulated from each other bya suitable coating of varnish, so as to diminish as much as possiblemagnetic short-circuits which might be formed between two contiguouslaminas owing to differences in their magnetic potential, also todiminish the eddy-currents which would otherwise take place throughtheir mass owing to the stator armature reactions.

Aring l 3, of soft-iron laminze 14, having four oppositely-disposedpolar projections l5, is clamped to the casing I by means of insulatedbolts 16. Coils 17 are wound around ring 13 between the polarprojections 15, the oppositely-disposed coils being connected togethereither in series or in parallel, thus forming two distinct circuits inwhich currents differing in phase from each other by ninety degrees aregenerated, as shown hereinafter.

An oil-well 18 is provided in the casing l, a loose ring 19 resting onthe shaft and depending into the oil-well acting as a medium forcarrying the oil to the shaft. The shaft is adapted to be rotated by anyconvenient means through pulley 20, keyed to the shaft. The sleeve ofthe pulley and the shaft itself are each provided with oil-grooves 21for preventing the surplus oil from working out into the casing andcausing the same to drip 'off and return to the oil-well throughoil-ducts 22 and 23, respectively. Acover 24 is adapted to be fastenedto the front of the casing by means of suitable screws 25 and serves asa support for the binding-posts 26, adapted to receive the terminals ofthe coils.

To facilitate an understanding of the mode of generating currents by theapparatus above IOO described, reference may be had to the diagrammaticviews Figs. 3 to 7, inclusive, which show the changes in thedistribution of the magnetic iield threading through f the fourstationary coils while the iield-magnet rotates through an angle of onehundred and eighty degrees. An inspection of these iigures shows thatthe intensity of the magnetic iiuX threading through opposite coils a a2vpasses from minimum in Fig. 3 to maximum in Fig. 5, reverting to aminimum in Fig. 7, after having passed through intermediate values inFigs. 4 and 6. In the same manner the magnetic l'lux threading throughthe opposite coils b t2 undergoes similar variations but it will benoticed that this variation occurs ninety degrees before or aftersimilar variations occur in the intensity of the magnetic fieldthreading through the coils a a2.

According to the Well-known law of induction the two alternatingcurrents,respectively, generated in the circuits of the coils a L2 1) b2must differ in phase from each other by ninety degrees, and aretherefore suitable for the production of sparks for the ignition ofexplosive mixtures according to my Patent No. 752,690. Fig. 8 representsdiagrammatically the simultaneous values of the two alternating currentsdelivered by each circuit during a revolution of the rotor through anangle of one hundred and eighty degrees.

What I claim, and desire to secure by Letters Patent, is-

1. A polyphase alternator comprising a rotor consisting of a permanentmagnet having a plurality of separately-magnetized steel laminaesubstantially annular in shape and so magnetized that two consequentpoles are Jformed at opposite ends of the same diameter.

2. A polyphase alternator comprising a rotor consisting of a permanentmagnet having a plurality of separately-magnetized steel laminaesubstantially annular in shape, said magnet having polar projections atopposite ends of the same diameter.

3. A polyphase alternator comprising a stationary soft-iron laminatedring having a plurality of polar prejections, stationary coils wound onsaid ring between said polar projections, and a rotor consisting of apermanent magnet having a plurality of separately-magnetiZed steellaminas substantially annular in shape and so magnetized that twoconsequent poles are formed at opposite ends of the same diameter.

4. A polyphase alternator comprising a stationary soft-iron laminatedring having four polar projections, stationary coils wou nd on said ringbetween said polar projections the opposite coils being connected inseries or in parallel to form two independent circuits, and an annularpermanent magnet adapted to be rotated within the ring, said permanentmagnet consisting of a plurality of separatelymagnetized steel laminzesubstantially annular in shape and so magnetized that two consequentpoles are formed at opposite ends ol the same diameter.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

LEON JULES LE PONTOIS.

Vitnesses:

E. F. PORTER, CHARLEs S. JoNEs.

